5-substituted-9-disubstituted amino-12-substituted carbonylbenzo[a]phenoxazines
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United States of America Patent
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Aug 5, 1986
Issued Date -
N/A
app pub date -
Sep 3, 1985
filing date -
Jul 31, 1984
priority date (Note) -
Expired
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Abstract
5-[N-(RCO)-N-R.sup.1 -amino] or (RCOO)-9-(N-R.sup.2 -N-R.sup.3 -amino)-12-(RCO)benzo[a]phenoxazines useful as color formers, particularly in electrochromic recording systems, are prepared by the interaction of the corresponding 5-(N-R.sup.1 -amino)-9-(N-R.sup.2 -N-R.sup.3 -amino)benzo[a]phenoxazinium halide or 9-(N-R.sup.2 -N-R.sup.3 -amino)benzo[a]phenoxazin-5-one with a reducing agent to obtain the corresponding leuco compound and subsequently interacting the leuco compound with at least two molecular proportions of an acylating agent.
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